drivers/regulator/fan53555.c

   1 /*
   2  * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
   3  *
   4  * Supported Part Numbers:
   5  * FAN53555UC00X/01X/03X/04X/05X
   6  *
   7  * Copyright (c) 2012 Marvell Technology Ltd.
   8  * Yunfan Zhang <yfzhang@marvell.com>
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15 #include <linux/module.h>
  16 #include <linux/param.h>
  17 #include <linux/err.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/of_device.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25 #include <linux/regmap.h>
  26 #include <linux/regulator/fan53555.h>
  27
  28 /* Voltage setting */
  29 #define FAN53555_VSEL0          0x00
  30 #define FAN53555_VSEL1          0x01
  31 /* Control register */
  32 #define FAN53555_CONTROL        0x02
  33 /* IC Type */
  34 #define FAN53555_ID1            0x03
  35 /* IC mask version */
  36 #define FAN53555_ID2            0x04
  37 /* Monitor register */
  38 #define FAN53555_MONITOR        0x05
  39
  40 /* VSEL bit definitions */
  41 #define VSEL_BUCK_EN    (1 << 7)
  42 #define VSEL_MODE               (1 << 6)
  43 #define VSEL_NSEL_MASK  0x3F
  44 /* Chip ID and Verison */
  45 #define DIE_ID          0x0F    /* ID1 */
  46 #define DIE_REV         0x0F    /* ID2 */
  47 /* Control bit definitions */
  48 #define CTL_OUTPUT_DISCHG       (1 << 7)
  49 #define CTL_SLEW_MASK           (0x7 << 4)
  50 #define CTL_SLEW_SHIFT          4
  51 #define CTL_RESET                       (1 << 2)
  52
  53 #define FAN53555_NVOLTAGES      64      /* Numbers of voltages */
  54
  55 enum fan53555_vendor {
  56         FAN53555_VENDOR_FAIRCHILD = 0,
  57         FAN53555_VENDOR_SILERGY,
  58 };
  59
  60 /* IC Type */
  61 enum {
  62         FAN53555_CHIP_ID_00 = 0,
  63         FAN53555_CHIP_ID_01,
  64         FAN53555_CHIP_ID_02,
  65         FAN53555_CHIP_ID_03,
  66         FAN53555_CHIP_ID_04,
  67         FAN53555_CHIP_ID_05,
  68 };
  69
  70 enum {
  71         SILERGY_SYR82X = 8,
  72 };
  73
  74 struct fan53555_device_info {
  75         enum fan53555_vendor vendor;
  76         struct regmap *regmap;
  77         struct device *dev;
  78         struct regulator_desc desc;
  79         struct regulator_dev *rdev;
  80         struct regulator_init_data *regulator;
  81         /* IC Type and Rev */
  82         int chip_id;
  83         int chip_rev;
  84         /* Voltage setting register */
  85         unsigned int vol_reg;
  86         unsigned int sleep_reg;
  87         /* Voltage range and step(linear) */
  88         unsigned int vsel_min;
  89         unsigned int vsel_step;
  90         /* Voltage slew rate limiting */
  91         unsigned int slew_rate;
  92         /* Sleep voltage cache */
  93         unsigned int sleep_vol_cache;
  94 };
  95
  96 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
  97 {
  98         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
  99         int ret;
 100
 101         if (di->sleep_vol_cache == uV)
 102                 return 0;
 103         ret = regulator_map_voltage_linear(rdev, uV, uV);
 104         if (ret < 0)
 105                 return ret;
 106         ret = regmap_update_bits(di->regmap, di->sleep_reg,
 107                                         VSEL_NSEL_MASK, ret);
 108         if (ret < 0)
 109                 return ret;
 110         /* Cache the sleep voltage setting.
 111          * Might not be the real voltage which is rounded */
 112         di->sleep_vol_cache = uV;
 113
 114         return 0;
 115 }
 116
 117 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 118 {
 119         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 120
 121         switch (mode) {
 122         case REGULATOR_MODE_FAST:
 123                 regmap_update_bits(di->regmap, di->vol_reg,
 124                                 VSEL_MODE, VSEL_MODE);
 125                 break;
 126         case REGULATOR_MODE_NORMAL:
 127                 regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132         return 0;
 133 }
 134
 135 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 136 {
 137         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 138         unsigned int val;
 139         int ret = 0;
 140
 141         ret = regmap_read(di->regmap, di->vol_reg, &val);
 142         if (ret < 0)
 143                 return ret;
 144         if (val & VSEL_MODE)
 145                 return REGULATOR_MODE_FAST;
 146         else
 147                 return REGULATOR_MODE_NORMAL;
 148 }
 149
 150 static const int slew_rates[] = {
 151         64000,
 152         32000,
 153         16000,
 154          8000,
 155          4000,
 156          2000,
 157          1000,
 158           500,
 159 };
 160
 161 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 162 {
 163         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 164         int regval = -1, i;
 165
 166         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 167                 if (ramp <= slew_rates[i])
 168                         regval = i;
 169                 else
 170                         break;
 171         }
 172
 173         if (regval < 0) {
 174                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 175                 return -EINVAL;
 176         }
 177
 178         return regmap_update_bits(di->regmap, FAN53555_CONTROL,
 179                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 180 }
 181
 182 static struct regulator_ops fan53555_regulator_ops = {
 183         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 184         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 185         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 186         .map_voltage = regulator_map_voltage_linear,
 187         .list_voltage = regulator_list_voltage_linear,
 188         .set_suspend_voltage = fan53555_set_suspend_voltage,
 189         .enable = regulator_enable_regmap,
 190         .disable = regulator_disable_regmap,
 191         .is_enabled = regulator_is_enabled_regmap,
 192         .set_mode = fan53555_set_mode,
 193         .get_mode = fan53555_get_mode,
 194         .set_ramp_delay = fan53555_set_ramp,
 195 };
 196
 197 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 198 {
 199         /* Init voltage range and step */
 200         switch (di->chip_id) {
 201         case FAN53555_CHIP_ID_00:
 202         case FAN53555_CHIP_ID_01:
 203         case FAN53555_CHIP_ID_03:
 204         case FAN53555_CHIP_ID_05:
 205                 di->vsel_min = 600000;
 206                 di->vsel_step = 10000;
 207                 break;
 208         case FAN53555_CHIP_ID_04:
 209                 di->vsel_min = 603000;
 210                 di->vsel_step = 12826;
 211                 break;
 212         default:
 213                 dev_err(di->dev,
 214                         "Chip ID %d not supported!\n", di->chip_id);
 215                 return -EINVAL;
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 222 {
 223         /* Init voltage range and step */
 224         switch (di->chip_id) {
 225         case SILERGY_SYR82X:
 226                 di->vsel_min = 712500;
 227                 di->vsel_step = 12500;
 228                 break;
 229         default:
 230                 dev_err(di->dev,
 231                         "Chip ID %d not supported!\n", di->chip_id);
 232                 return -EINVAL;
 233         }
 234
 235         return 0;
 236 }
 237
 238 /* For 00,01,03,05 options:
 239  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 240  * For 04 option:
 241  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 242  * */
 243 static int fan53555_device_setup(struct fan53555_device_info *di,
 244                                 struct fan53555_platform_data *pdata)
 245 {
 246         int ret = 0;
 247
 248         /* Setup voltage control register */
 249         switch (pdata->sleep_vsel_id) {
 250         case FAN53555_VSEL_ID_0:
 251                 di->sleep_reg = FAN53555_VSEL0;
 252                 di->vol_reg = FAN53555_VSEL1;
 253                 break;
 254         case FAN53555_VSEL_ID_1:
 255                 di->sleep_reg = FAN53555_VSEL1;
 256                 di->vol_reg = FAN53555_VSEL0;
 257                 break;
 258         default:
 259                 dev_err(di->dev, "Invalid VSEL ID!\n");
 260                 return -EINVAL;
 261         }
 262
 263         switch (di->vendor) {
 264         case FAN53555_VENDOR_FAIRCHILD:
 265                 ret = fan53555_voltages_setup_fairchild(di);
 266                 break;
 267         case FAN53555_VENDOR_SILERGY:
 268                 ret = fan53555_voltages_setup_silergy(di);
 269                 break;
 270         default:
 271                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 272                 return -EINVAL;
 273         }
 274
 275         return ret;
 276 }
 277
 278 static int fan53555_regulator_register(struct fan53555_device_info *di,
 279                         struct regulator_config *config)
 280 {
 281         struct regulator_desc *rdesc = &di->desc;
 282
 283         rdesc->name = "fan53555-reg";
 284         rdesc->supply_name = "vin";
 285         rdesc->ops = &fan53555_regulator_ops;
 286         rdesc->type = REGULATOR_VOLTAGE;
 287         rdesc->n_voltages = FAN53555_NVOLTAGES;
 288         rdesc->enable_reg = di->vol_reg;
 289         rdesc->enable_mask = VSEL_BUCK_EN;
 290         rdesc->min_uV = di->vsel_min;
 291         rdesc->uV_step = di->vsel_step;
 292         rdesc->vsel_reg = di->vol_reg;
 293         rdesc->vsel_mask = VSEL_NSEL_MASK;
 294         rdesc->owner = THIS_MODULE;
 295
 296         di->rdev = devm_regulator_register(di->dev, &di->desc, config);
 297         return PTR_ERR_OR_ZERO(di->rdev);
 298 }
 299
 300 static const struct regmap_config fan53555_regmap_config = {
 301         .reg_bits = 8,
 302         .val_bits = 8,
 303 };
 304
 305 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 306                                               struct device_node *np,
 307                                               const struct regulator_desc *desc)
 308 {
 309         struct fan53555_platform_data *pdata;
 310         int ret;
 311         u32 tmp;
 312
 313         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 314         if (!pdata)
 315                 return NULL;
 316
 317         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 318
 319         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 320                                    &tmp);
 321         if (!ret)
 322                 pdata->sleep_vsel_id = tmp;
 323
 324         return pdata;
 325 }
 326
 327 static const struct of_device_id fan53555_dt_ids[] = {
 328         {
 329                 .compatible = "fcs,fan53555",
 330                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 331         }, {
 332                 .compatible = "silergy,syr827",
 333                 .data = (void *)FAN53555_VENDOR_SILERGY,
 334         }, {
 335                 .compatible = "silergy,syr828",
 336                 .data = (void *)FAN53555_VENDOR_SILERGY,
 337         },
 338         { }
 339 };
 340 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 341
 342 static int fan53555_regulator_probe(struct i2c_client *client,
 343                                 const struct i2c_device_id *id)
 344 {
 345         struct device_node *np = client->dev.of_node;
 346         struct fan53555_device_info *di;
 347         struct fan53555_platform_data *pdata;
 348         struct regulator_config config = { };
 349         unsigned int val;
 350         int ret;
 351
 352         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 353                                         GFP_KERNEL);
 354         if (!di)
 355                 return -ENOMEM;
 356
 357         pdata = dev_get_platdata(&client->dev);
 358         if (!pdata)
 359                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 360
 361         if (!pdata || !pdata->regulator) {
 362                 dev_err(&client->dev, "Platform data not found!\n");
 363                 return -ENODEV;
 364         }
 365
 366         di->regulator = pdata->regulator;
 367         if (client->dev.of_node) {
 368                 const struct of_device_id *match;
 369
 370                 match = of_match_device(of_match_ptr(fan53555_dt_ids),
 371                                         &client->dev);
 372                 if (!match)
 373                         return -ENODEV;
 374
 375                 di->vendor = (unsigned long) match->data;
 376         } else {
 377                 /* if no ramp constraint set, get the pdata ramp_delay */
 378                 if (!di->regulator->constraints.ramp_delay) {
 379                         int slew_idx = (pdata->slew_rate & 0x7)
 380                                                 ? pdata->slew_rate : 0;
 381
 382                         di->regulator->constraints.ramp_delay
 383                                                 = slew_rates[slew_idx];
 384                 }
 385
 386                 di->vendor = id->driver_data;
 387         }
 388
 389         di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 390         if (IS_ERR(di->regmap)) {
 391                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 392                 return PTR_ERR(di->regmap);
 393         }
 394         di->dev = &client->dev;
 395         i2c_set_clientdata(client, di);
 396         /* Get chip ID */
 397         ret = regmap_read(di->regmap, FAN53555_ID1, &val);
 398         if (ret < 0) {
 399                 dev_err(&client->dev, "Failed to get chip ID!\n");
 400                 return ret;
 401         }
 402         di->chip_id = val & DIE_ID;
 403         /* Get chip revision */
 404         ret = regmap_read(di->regmap, FAN53555_ID2, &val);
 405         if (ret < 0) {
 406                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 407                 return ret;
 408         }
 409         di->chip_rev = val & DIE_REV;
 410         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 411                                 di->chip_id, di->chip_rev);
 412         /* Device init */
 413         ret = fan53555_device_setup(di, pdata);
 414         if (ret < 0) {
 415                 dev_err(&client->dev, "Failed to setup device!\n");
 416                 return ret;
 417         }
 418         /* Register regulator */
 419         config.dev = di->dev;
 420         config.init_data = di->regulator;
 421         config.regmap = di->regmap;
 422         config.driver_data = di;
 423         config.of_node = np;
 424
 425         ret = fan53555_regulator_register(di, &config);
 426         if (ret < 0)
 427                 dev_err(&client->dev, "Failed to register regulator!\n");
 428         return ret;
 429
 430 }
 431
 432 static const struct i2c_device_id fan53555_id[] = {
 433         {
 434                 .name = "fan53555",
 435                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 436         }, {
 437                 .name = "syr82x",
 438                 .driver_data = FAN53555_VENDOR_SILERGY
 439         },
 440         { },
 441 };
 442 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 443
 444 static struct i2c_driver fan53555_regulator_driver = {
 445         .driver = {
 446                 .name = "fan53555-regulator",
 447                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 448         },
 449         .probe = fan53555_regulator_probe,
 450         .id_table = fan53555_id,
 451 };
 452
 453 module_i2c_driver(fan53555_regulator_driver);
 454
 455 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 456 MODULE_DESCRIPTION("FAN53555 regulator driver");
 457 MODULE_LICENSE("GPL v2");